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David Walsh Blog

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    Creating Spacers with Flexbox

    I was one of the biggest fans of flexbox before it hit but, due to being shuffled around at Mozilla, I never had the chance to use it in any practice project; thus, flexbox still seems like a bit of a mystery to me.  This greatly...

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    Script & Style Show: Episode 7: Open Source with Ashley Grant

    On this week's episode we welcome Ashley Grant of Aurelia fame to talk about open source: the good, the bad, the ugly, and the scary.  Enjoy!

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    The Dark Side of Promises

    Since the release of es6 many new features have found their way into NodeJS, but non had quite the same impact as promises. Promises have been developed for the browser before es6 was even a thing. There were several implementations that have been used like jQuery's...

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    Script & Style Show: Episode 6: Debugging with Jason Laster

    On this week's episode: we welcome my colleague Jason Laster from Mozilla to speak about the Firefox DevTools debugger. We talk debugging, console shame, the future of JavaScript debuggers, and more! Have ideas for the next episode? Comment below!

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    Destructuring and Function Arguments

    The JavaScript language has benefitted from some really awesome new features over the past few years, including arrow functions, the spread operator, and default function argument values.  Even if your browser doesn't yet support proposed JavaScript API syntax additions, you can use a tool like...

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    Script & Style Show: Episode 5: Q&A

    On this week's episode:  Todd's back from vacation while David's knee-deep in a Firefox Debugger breakpoint UI update.  We eventually move on to viewer questions that range form JavaScript knowledge, the Array.flatten controversy, front-end testing (TDD vs. BDD), and mastering work-life balance.  Enjoy! As always, please get...

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    Incapsula Web Application Firewall

    When I speak with people who have interviewed for front-end jobs at cryptocurrency exchanges, they always tell me how surprised they are that a majority of the interview questions are security-centric.  Basic front-end security practices are fair game for all front-end developer interviews but anything...

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    Set a Default Push Remote with git

    During my early days of git usage, my config allowed me to simply type git push instead of git push {origin} {branch_name} which I need to now.  Up until recently I needed to type out the long version...(I know)...which was incredibly annoying because I like using detailed branch...

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    5 Crucial Concepts for Learning d3.js and How to Understand Them

    You may have already heard about d3.js, the dazzling JavaScript library that lets you create beautiful charts and graphics with just a few lines of code. You might have seen some of the fantastic examples of D3 in action, or you may have heard that...

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    Exchange Rates and Currency Conversion with fixer.io

    My most stressful tasks as a coder have always revolved around money.  Whether you're coding a site for a client, your own business, or your employer, you want to be damn sure that any handling of currency is accurate, secure, and localized.  We always want...

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    How to Create a RetroPie on Raspberry Pi – Graphical Guide

    Today we get to play amazing games on our super powered game consoles, PCs, VR headsets, and even mobile devices.  While I enjoy playing new games these days, I do long for the retro gaming systems I had when I was a kid: the original Nintendo...

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    Conquering Impostor Syndrome

    Two years ago I documented my struggles with Imposter Syndrome and the response was immense.  I received messages of support and commiseration from new web developers, veteran engineers, and even persons of all experience levels in other professions.  I've even caught myself reading the post...

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    Being a Dev Dad

    I get asked loads of questions every day but I'm always surprised that they're rarely questions about code or even tech -- many of the questions I get are more about non-dev stuff like what my office is like, what software I use, and oftentimes...

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    JavaScript Promise API

    While synchronous code is easier to follow and debug, async is generally better for performance and flexibility. Why "hold up the show" when you can trigger numerous requests at once and then handle them when each is ready?  Promises are becoming a big part of the JavaScript world...

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    7 Essential JavaScript Functions

    I remember the early days of JavaScript where you needed a simple function for just about everything because the browser vendors implemented features differently, and not just edge features, basic features, like addEventListener and attachEvent.  Times have changed but there are still a few functions each developer should...

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    I’m an Impostor

    This is the hardest thing I've ever had to write, much less admit to myself.  I've written resignation letters from jobs I've loved, I've ended relationships, I've failed at a host of tasks, and let myself down in my life.  All of those feelings were very...

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    fetch API

    One of the worst kept secrets about AJAX on the web is that the underlying API for it, XMLHttpRequest, wasn't really made for what we've been using it for.  We've done well to create elegant APIs around XHR but we know we can do better.  Our effort to...